Furnace control mechanism



C-' R. ABBOTT.

FURNACE CONTROL MECHANISM. APPLICATION men AUG. 1. 1921.

1,428,516; PatentedSe t.12,1922..

A TTORNEYS.

Patented Sept. 12, 1922.

n STATES CHRISTOPHEB. narrow,

or AnnnnsoN, INDIANA.

. runnacn conrnon MECHANISM.

I [Application filed August 1,

To ,allrphomjt may concern; V I Be itknown that I, Cirnrsrorigrnn R. ABBoTT, acitizen ofthe United States, and a resident of Anderson, .countyof Madison, and State of Indiana, haveinvented a cer tain new andusefulFnrnace Control Mecha nism; and Iv do hereby declare that thefollowing is aiull', clear, and exact description thereof, referencebeing had to the accompanying drawings, in which like numerals refer tolike parts. 1 I 5 This invention relates to furnace control mechanismand the chief object thereof is to provide simple and positive means forcontrolling the check anddraft controlsof a furnace. H The features ofthe invention are such as will accomplish allot thefl foregoing objects.The full nature of the invention will be understood fromthe accompanying(drawings and, the] following description and claims. 1 i

.In the drawings, Fig. 1 is an elevational View of a furnace withtheinvention associated therewith, "Fig. 2' isatop planviow of theinvention; ,Fig.,3,is.a side velevational view of the invention. Fig; 1is a sectional viewtaken on line; of Fig. 2.

"In the drawings 101'ndicates'a heating device or, furnace,thatherein'illustrated being ofthehot water type, andfsaid furnaceforheating device is provided with, the usual draft 1l, closed a hingedplate and a smoke pipe 13'controlled byacheck valve 1 1. Herein theparticular type. of mecha nism associated with the draft and check meansor controls', is a;rock shaft 15 movable by. a ,counte'rweightedfreverie associated with ,which, is the counterweight, 17. I The leverisflalsoassociated through the, rod or cable .17 f with; {the draftvalve "or plate 1 2. This control mechanism iis fold inthe art and formsno part of the invention, andv the particular type herein .illustratedfsuch that the control is automaticp tliat is, that the furnace isprovided. withmeanssuch that as the steam pressure increasesbeyondaprede termined pressure, "the counterwei hted lever closes the: draftand opens the' c eck, and when the pressure ofthe steam heating systemdecreases, ,thes e mechanism is adapted to open thel idraft and close 1the 19 21. Serial no. 488,907.

check, thereby maintaining a uniform condition. This feature istemperature operable, as well as pressure operable, and in the latterinstance would be thermostatically controlled.

v.Heretofore it hasbeen the custom when the automatic control is to berendered inoperative, such as during the night when the fire is to bechecked, suitable means has been provided for locking the lever 16,sothat the same will not be movable by the counterweight 17 and thecontrolling means heretofore, described. Also it has been the custom todisconnect the cable means 17 from said lever, thereby insuring that thedraft will not be opened. In the present invention one endof the lever16 is connected to a cable or chain 20 which is associated with suitablepulley means 21 and terminates in a ring 22. The full and dotted linepositions in Fig. 1 illustrate the respective positions of the check anddraft valves and the main controlling lever 16. Thus, when the parts areinthe full line position as shown, the check is open and the draftclosed; while in theif suitable means is provided to hold the chain orcable 20 in its full lineposition, the fire in the furnace will bechecked, and that when the cable means 20 is released, the draft will beopened. Means is provided for maintaining the cable 20 in its latchedposition and releasing the same at the desired time, and is illustratedin detail in Figs. 2, 3 and 4.. In said figures,"25- indicates abasememher, whichcarries at one end a bracket 26 which is slottedas at27, and extending throu slot 2% are thealigned openings 28. The slot 27,as shown clearly in Figs. 1, and 3, is adapted .;to receive, the ring22. A suitable bolt member 29 slidably supported in the aligned-openings28 is adapted to maintain upon or lock the ring to the bracket. Theopposite end of the bolt 29 is likewise slidably supported in a bracket30 secured to the base plate 25. Thebracket 30 has an opening. 31inalignment with the aligned openings 28. Concentric withthe bolt 29 isa coiled spring .32 which bears at one end saidbracketandtransversely ofthe against the brack'e't 26 andat the other end I comprises a lever 34which is hingedly sup-.

ported at 35 upon the base plate 25,'and said lever, as shown clearly inFigs. 2 and 4,

straddles the bolt 29 and bears against the collar 33. Y

The means for latching the bolt'29 comprises a catch member 36which "ispivotally supported at 37. One end of said catch member, which isessentially a lever, is provided with a counterweight 38 for maintainingsaid lever in the position shown in Fig. 4, whereby the bolt 29 issecured in the position shown in Figs. 2 and3. A suitable extension 39of the bracket 30 carries a guide member 40 which limits the transversemove ment of the lever 36, but permits itsrocking movement onthe pivot37 in a'plane perpendicular to the movement of the bolt 29. The otherend of the lever 36 or latching member is provided with a trippingportion herein shown in the form of a padded plate 41. Suitablysupported on the extension42, which provides a pivotal support forthelever 36, is an overhanging portion 43 which carries an-adjusting member44 which may be locked inadjusted position by a lock nut 45. Theadjusting member 44 v is herein shown in the form of a bolt whichengagesa transversely extending portion 46 on s the lever 36, and it is by theaforesaid means that the normal position of'the lever 36 is adjusted.Also positioned upon the base member 25 is a supporting plate50 whichterminates in an extension 51 substantially parallel to the lever 36.The extension "51 comprises a circular portion 52 and a wing portion 53.A suitable'clock 54 is provided with a dial 55, theusual alarm dial 56with the several hands 57 ,the winding devices 58 and the settingdevices 59. Saidclock carries a complementarily formed socket member 60,andsaid member is key-hole shaped to receive the ciroularand wingportion of the supporting bracket 50. The base member 25 is herein shownprovided'with a slot 61 so that the extension "51 does not project veryfar beyond the base 25. Theclock 54 is provided with the usual alarmhammer 62 which usually is adapted to strike the alarm bell, but in thepresent instance is positioned adjacent tothe plate 41 and is adapted tostrike the same, thereby tripping the lever 36011 its pivot 37 inopposition to the weight 38 to permit the bolt 29 to be projected bymeans of the spring 28 into such position that the ring 22 will bereleased from the bracket 26, thus permitting the weight 17, see Fig. 1,to become operative to actuate the lever and thereby open the draft 12and close the check 14.

The invention claimed-is; v

1. In a clock controlled device,the com bination of a clock, yieldinglymounted releasable means, latchingmechanism therefor and releasable bysaid clock, a Weight for maintaining-said latching mechanism in thelatching position, and means for adjusting :the latching position ofsaid latching mechanism.

2. A releasing mechanism in combination with a cable normally undertension and a retainin member therefor,including a bearing brac kethaving aslot 'therein' communieating with and extending"transversely o fsaid bearing, for receiving said retaining member, a bolt slidablysupported in said bearing bracket and having an end adapted to bridgesaid slot for-retaining said retaining member and'said "cable and meansfor sliding said bolt to remove the's'ame from the slot and" releasingsaid member and'said cable fromthete'nsion.

3. A releasin me'sch'an'ismincluding a plurality of bearing brackets,one end bracket having a slot therein communicating with'and extendingtransverselyof the bearing, a bolt slidablysupported"insaid bearingbrackets and having an'end adapted to bridge saidslot forretainingpurposes, retaining means adj acent'theother end bra-cket for retainingthe bolt in the bridging position, and yielding means for sliding thebolt from the bridging position when the retaining means is actuated.

4. A releasingimechanism' including a plurality of bearing brackets, one'end bracket having a-slot therein communicating with and'extendingtransversely of the bearing, a bolt slidably supported in said bearingbrackets and having an end adapted to bridge said slot for retainingpurposes, retaining means adjacent the other end bracket for retainingthe bolt inthe bridging positiomanabutment rigid with said bolt, acoiled .springfhaving one end bearing on'said abutment and the other endsta'tion'arily secured, and a movab'ly mounted resetting member forengaging the opposite side of the abutment for returning said bolt tothe bridging positionin opposition to said spring.

5. A releasing mechanism including a plurality of bearing brackets, oneend bracket having a slot therein communicating with and extendingtransversely of the bearing, a bolt s'lidably supported in said bearing"brackets and having-an end a dapted to bridge said slot for retainingpurposes, retaining means adjacent the other'end'bracket forretainingthe boltin the bridgin position, an abutment rigid with said 0a, a

coiled spring having one end bearing on said abutment and the other endstationarily secured, a movably mounted resetting member for engagingthe opposite side of the abutment for returing said bolt to the bridgingposition in opposition to said spring, and means associated with theretainig means for automatically returning said retaining means to theretaining position simultaneously with the return of the bolt to thebridging posi- 10 tion.

In witness whereof, I have hereunto aflixed my signature.

CHRISTOPHER R. ABBOTT.

